【作者】 朱孜毅； 孟利； 陈冷；

【Author】 Z.Y.Zhu;L.Meng;L.Chen;School of Materials Science and Engineering,University of Science and Technology Beijing;Central Iron and Steel Research Institute;

【机构】 北京科技大学材料科学与工程学院； 钢铁研究总院；

【摘要】 Co-Cr合金L605是一种性能优异的高温合金。由于其良好的生物兼容性和射线不可穿透性,近年来在生物医用领域得到广泛应用。本文研究了Co-Cr合金L605中碳化物析出的类型、机理及其对材料强度和塑性的影响。通过对时效样品进行金相、扫描电镜和透射电镜观察,实验结果表明,晶界上析出了大量的碳化物,碳化物的类型主要是一次析出碳化物M₇C₃和二次析出碳化物M₆C、M₂₃C₆。我们发现,在时效过程中一次析出碳化物M₇C₃逐渐分解并原位析出二次碳化物M₆C,二次析出碳化物M₂₃c₆大量优先析出于孪晶和基体的三叉交界处。我们认为,一次析出碳化物M₇C₃退化分解为M₆C是提高L605强度的一种重要机制,二次析出碳化物M₂₃C₆在孪晶和基体的三叉交界处析出对提高L605塑性起着至关重要的作用。更多还原

【Abstract】 Co-Cr Alloy L605 is a high-temperature alloy with excellent properties.In recent years,it has been widely used in the field of biomedical applications due to its good biocompatibility and ray impermeability.In this work,we investigated the precipitation type and mechanism of carbide and the effect of carbide on the strength and plasticity are studied in Co-Cr alloy L605.The aging samples were observed by metallography,scanning electron microscopy and transmission electron microscopy.The experimental results show that a lot of carbides were precipitated on the grain boundaries and carbide types were primary M₇ C₃ carbide and secondary M₆ C,M₂₃C₆ carbide.We discovered that,the primary M₇ C₃ was decomposed gradually with the secondary M₆ C precipitating in situ during the aging process,and a lot of secondary M₂₃C₆ preferentially precipitate at grain and twin boundaries.We believe that M₇ C₃ decomposed to M₆ C is an important mechanism to improve the strength of L605,and M₂₃ C₆ precipitated preferentially at grain and twin boundaries plays an important role in improving the plasticity of L605.更多还原